The square root of 21233664 is 4608.
It is a Jordan-Polya number, since it can be written as (4!)4 ⋅ (2!)6.
It is an ABA number since it can be written as A⋅BA, here for A=4, B=48.
It is a Duffinian number.
It is an unprimeable number.
Almost surely, 221233664 is an apocalyptic number.
21233664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.
21233664 is the 4608-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21233664
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21233664 is an frugal number, since it uses more digits than its factorization.
21233664 is an odious number, because the sum of its binary digits is odd.
The cubic root of 21233664 is about 276.9119174990.
Multiplying 21233664 by its product of digits (5184), we get a 8-th power (110075314176 = 248).
21233664 divided by its product of digits (5184) gives a 12-th power (4096 = 212).
Adding to 21233664 its reverse (46633212), we get a palindrome (67866876).
The spelling of 21233664 in words is "twenty-one million, two hundred thirty-three thousand, six hundred sixty-four".